Resistance spot welding of dissimilar austenitic/duplex stainless steels: Microstructural evolution and failure mode analysis

2017 ◽  
Vol 28 ◽  
pp. 186-196 ◽  
Author(s):  
M. Alizadeh-Sh ◽  
S.P.H. Marashi
Keyword(s):  
Failure Mode ◽  
Microstructural Evolution ◽  
Stainless Steels ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Duplex Stainless Steels ◽  
Mode Analysis ◽  
Resistance Spot ◽  
Failure Mode Analysis

Dissimilar resistance spot welding of AISI 304 to AISI 409 stainless steels: mechanical properties and microstructural evolutions

2018 ◽  
Vol 115 (6) ◽  
pp. 610 ◽  
Author(s):  
Mehdi Safari ◽  
Hossein Mostaan ◽  
Abdoreza Ghaderi
Keyword(s):  
Stainless Steels ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Steel Sheet ◽  
Welding Current ◽  
Stainless Steel Sheet ◽  
Tensile Shear ◽  
Aisi 304 ◽  
Resistance Spot ◽  
Electrode Force

In this work, dissimilar resistance spot welding of austenitic stainless steel sheet (304 grade) and ferritic stainless steel sheet (409 grade) is studied experimentally. For this purpose, the effects of process parameters such as welding current, welding time and electrode force on tensile-shear strength of resistance spot welded joints are investigated with response surface methodology (RSM). Also, microstructural evolutions during resistance spot welding process of AISI 409 and AISI 304 stainless steels are evaluated by optical microscopy. It is concluded from results that the tensile-shear strength of spot welds is increased with increasing the welding current, welding time and electrode force. It is shown that widmanstatten ferrites have been grown in the weld metal of dissimilar resistance spot welds of AISI 304 and AISI 409 stainless steels.

scholarly journals Resistance Spot Welding of SUS316L Austenitic/SUS425 Ferritic Stainless Steels: Weldment Characteristics, Mechanical Properties, Phase Transformation and Solidification

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 710 ◽  
Author(s):  
Khuenkaew ◽  
Kanlayasiri
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Stainless Steels ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Lap Joints ◽  
Welding Time ◽  
Welding Condition ◽  
Resistance Spot ◽  
Weld Current

This research examines the weldment characteristics and mechanical properties of lap joints of SUS316L/SUS425 stainless steels using resistance spot welding under variable weld currents and welding times. The weld current was varied between 7.0, 8.5, and 10.0 kA, and the welding time between 25, 38, and 50 cycles. The weldment quality characteristics under study were the depth of fusions, indentation depths, and nugget diameter, and the mechanical properties included the tensile shear force (TSF) and micro Vickers hardness. Phase transformation and solidification were characterized using scanning electron microscopy and energy dispersive X-ray spectrometry, together with Schaeffler and pseudo-binary predictive phase diagrams. The results revealed that the weldment quality was positively correlated with weld current and welding time, as were the TSF and micro hardness. The optimal welding condition was achieved under a 10.0 kA weld current and 25-cycle welding time. Under the optimal condition, the fusion zone exhibited compression-direction columnar grains consisting of austenite, ferrite, and martensite and the solidification was of ferrite plus Widmanstatten austenite.

Characteristics of Welding Crack Defects and Failure Mode in Resistance Spot Welding of DP780 Steel

2016 ◽  
Vol 23 (10) ◽  
pp. 1104-1110 ◽  
Author(s):  
Xiao-pei Wang ◽  
Yong-qiang Zhang ◽  
Jian-bin Ju ◽  
Jian-qiang Zhang ◽  
Jian-wei Yang
Keyword(s):  
Failure Mode ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Resistance Spot ◽  
Dp780 Steel

Resistance spot welding of additively manufactured maraging steels Part I: Nugget formation

2021 ◽  
pp. 1-34
Author(s):  
Cheng Luo ◽  
Yansong Zhang ◽  
Michael Oelscher ◽  
Yandong Shi ◽  
Niels Pasligh ◽  
...  
Keyword(s):  
Maraging Steel ◽  
Fusion Zone ◽  
Microstructural Evolution ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Solidification Process ◽  
Melting Process ◽  
Rapid Solidification Process ◽  
Laser Melting ◽  
Resistance Spot

Abstract Application of additively manufactured steels is unavoidably involved in the resistance spot welding with conventionally manufactured steels. However, the microstructural evolution of an additive manufactured steel at high temperatures is still unknown, especially for the rapid solidification process. This paper investigated the microstructural evolution of a selective laser melted maraging steel during the rapid solidification process via resistance spot welding. Asymmetrical fusion zone with boat shape was found in the spot weld due to the rougher surface and larger electrical resistance of maraging steel via selective laser melting process. The rapid expansion of fusion zone at end of welding process was caused by the carbide formation at the heat-affected zone of maraging steel via selective laser melting process. Besides, printing orientation affected the surface roughness of a selective laser melted maraging steel and subsequently significantly influence the early stage of formation of fusion zone of additively manufactured maraging steel. We expect that our findings will pave the way to the future application of additively manufactured steels in the industries.

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